- JavaMail API (Utility)
requires 1 permissions: android.permission.INTERNET 
provides a platform-independent and protocol-independent framework to build mail and messaging applications.
- Android Support v4 (Development Framework)
The Android Support Library is not actually a single library, but rather a collection of libraries that can roughly be divided into two groups: compatibility and component libraries. For details, please see
Understanding the Android Support Library.
- AppCompat (Utility)
support newer Android features on older Android versions.
- Jetpack Compose (Development Framework)
a framework to define UIs programmatically with composable functions that describe its shape and data dependencies.
- Constraint Layout Library (Utility)
library to reduce the number of nested views needed.
- Coordinatorlayout (UI Component)
AndroidX library to position top-level application widgets, such as AppBarLayout and FloatingActionButton.
- Androidx Core (Utility)
a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs.
- Android Emoji2 Compat (UI Component)
core library to enable emoji compatibility in Kitkat and newer devices to avoid the empty emoji characters.
- AndroidX Fragment (UI Component)
AndroidX library to encapsulate part of the user interface or behavior into reusable components.
- Androidx Graphics (Utility)
leverages graphics facilities across multiple Android platform releases.
- Lifecycle (Utility)
perform actions in response to a change in the lifecycle status of another component, such as activities and fragments.
- ProfileInstaller (Utility)
AndroidX library that enables libraries to prepopulate ahead of time compilation traces to be read by ART.
- Room (Utility)
a persistence library that provides an abstraction layer over SQLite to allow for more robust database access while harnessing the full power of SQLite.
- Recyclerview (Utility)
display large sets of data in your UI while minimizing memory usage.
- Startup (Utility)
AndroidX library to implement a straightforward, performant way to initialize components at app startup.
- Android Jetpack VersionedParcelable (Utility)
Provides a stable but relatively compact binary serialization format that can be passed across processes or persisted safely.
- WorkManager (Utility)
an API that makes it easy to schedule deferrable, asynchronous tasks that must be run reliably .
- Google Material Design (Utility)
library to help with material design guidelines.
- Tink (Utility)
a multi-language, cross-platform library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
- ZXing Android Embedded (Utility)
Barcode scanning library for Android, using ZXing for decoding.
- OkHttp (Utility)
OkHttp is an HTTP+HTTP/2 client for Android and Java applications.
- JavaBeans(TM) Activation Framework (Development Framework)
services to determine the type of an arbitrary piece of data, encapsulate access to it, discover the operations available on it, and to instantiate the appropriate bean to perform said operation(s).
- Sun Mail (Utility)
part of the JavaMail™ API provides classes that model a mail system.
- JavaBeans Activation Framework (JAF) (Utility)
a standard extension to the Java platform that lets a developer take advantage of standard services to: determine the type of an arbitrary piece of data; encapsulate access to it; discover the operations available on it; and instantiate the appropriate bean to perform the operation(s).
- Bouncy Castle (Utility)
a collection of APIs used in cryptography. Also see
Wikipedia.
